Pull-Up Assistance Bands:Pull up bands are perfect for both fitness professionals and beginners. If you struggle with standard pull-ups, try our assisted pull up bands, which feature 4 resistance bands of varying strengths (providing 11 assistance levels up to 410 lbs). Help you progressively build strength until you can perform unassisted pull-ups. You can also use the 4 resistance bands individually for full-body workouts,and enhancing back training to achieve fitness goals more efficiently. One-Second Quick-Adjust Length:Simply press the button of pull up assist band to instantly adjust the strap length to match your height. Easily attaches to any door pull-up bar, chin-up bar, or pull-up station. Many people switch the height of the assist belt back and forth to train, in order to achieve better exercise results. At this time, a faster and more convenient adjustment method becomes very necessary.